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<title>Chinese Journal of Magnetic Resonance Imaging RSS feed</title>
<link>http://med-sci.cn/cgzcx/en/contents_list.asp?issue=201101</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[Current status on magnetic resonance industrial and technical development in China]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.003</link>
<description><![CDATA[In this article, the development history of MR imaging equipment and techniques was reviewed; the trend of MR imaging techniques in the near future was forecasted; the major questions existed in MR industry were analyzed, and the strategies and advice in accordance with the questions above were emphasized.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Fetal MR imaging: a new clinical application]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.004</link>
<description><![CDATA[Improvements in MR imaging now permit diagnostic images of the fetus to be obtained. The depth of structural information provided by MRI means it is more than just a useful adjunct to ultrasound, as several structures are more clearly visualized and many of the limitations of ultrasound are avoided. Currently, its value is best researched in fetal central nervous system disorders, MRI is most frequently utilized with reference to the fetal central nervous system and is valuable in ventriculomegaly, agenesis of the corpus callosum and posterior fossa abnormalities. Outside this, there is increasing interest in applying it to thoracic abnormalities and also scope for development in other niche areas. MRI is able to accurately determine fetal organ volumes and weight,although whether such measurements could play a role in conditions such as fetal growth restriction, has yet to be fully established. Techniques such as diffusion weighted imaging, magnetic resonance spectroscopy and functional imaging are also being remodelled for use in the fetus,improving our knowledge of in utero metabolism and development. This paper introduce the safety of fetal MRI, technology and the clinical application of the system.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[MR imaging, diffusion imaging, and proton MR spectroscopy at 3T in full-term neonates with hypoxic-ischemic encephalopathy]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.005</link>
<description><![CDATA[During the recent years, advanced magnetic resonance (MR) techniques and 3 Tesla magnets (3T) have increasingly been applied to neonates, and used to expand our knowledge of perinatal hypoxic-ischemic encephalopathy (HIE). In this review, we present the MR findings at 3T in the full-term neonates with HIE by using conventional imaging and advanced MR techniques, such as diffusion-weighted imaging (DWI), diffusion tensor imaging (DTI) and MR spectroscopy (MRS). The time course of lesions seen with each technique is emphasized, and correlated with the neurological outcome.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Continuous arterial spin labeling MR perfusion imaging in diagnosis of hypoxic ischemic encephalopathy in full-term neonates: Preliminary study]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.006</link>
<description><![CDATA[Objective: To investigate continuous arterial spin labeling (CASL) MR perfusion imaging in the quantitatively evaluation of early hemodynamic change in patients suffered from hypoxic ischemic encephalopathy (HIE). Materials and Methods: Twelve cases of full-term neonates suffered from HIE and 12 normal controls in 8-24 hours, 48 hours, and 7-12 days were recruited for MR T1 weighted, T2 weighted, diffusion weighted imaging, and CASL examination . Cerebral blood ﬂow (CBF) colour maps were obtained using Functool II package, and CBF values of bilateral patietal cortex, corona radiata, and basal ganglia were calculated. Results: CBF of patietal cortex was lower than that of basal ganglia (P<0.01), and CBF of white matter was lower than that of cortex (P<0.01) in normal full-term neonates. CBF values in patients were signiﬁcant decreased in each region of interest at 8-24 hours postnatal timepoint when compared with normal controls (P<0.05); However, no signiﬁcant difference of CBF values in white matter, and signiﬁcant difference of CBF values in both cortex and basal ganglia (P<0.05) were present 48 hours after hypoxic insult. There was no significant difference of CBF values in each region of interest 7-12 days after hypoxic insult when patients and normal controls were compared. Forty-eight hours after birth, the experimental group parietal cortex and basal ganglia (P<0.05) appeared congestive phenomena. Conclusion: CASL MR perfusion imaging plays an important role in the early diagnosis of HIE.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Application of susceptibility weighted imaging in pediatric neurologic disorders]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.007</link>
<description><![CDATA[Objective: To evaluate the clinical value of susceptibility weighted imaging (SWI) in pediatric neurologic disorders. Materials and Methods: SWI was applied to 42 cases of pediatric neurologic disorders (12 cases of traumatic brain injury, 20 cases of hypoxic-ischemic encephalopathy, 1 case of cavernous angioma, 2 cases of arterio-venous malformation, 1 cases of Sturge-Weber sydrome, 6 cases of neoplasms), and compared with conventional sequences (T1, T2 FLAIR, T2 FSE, DWI), and some of them with T1 postcontrast, MR angiography, MR spectroscopy. Results: SWI showed more lesions in diffusion axonal injury and subarachnoid hemorrhage. Due to the image artifacts, SWI was not as good as T1 FLAIR to detected Subdural hemorrhage. SWI showed more hemorrhage lesions in HIE than other sequences. Certain types of vascular malformations with slow flow had been shown to be better visualized with SWI, including cavernous angioma, arterio-venous malformation and sturge-weber syndrome. SWI increased the visibility of tumors and was helpful for depicting hemorrhage and increased vascularity in the neoplasms, which may reflect tumor grade. Conclusion  SWI was superior to the conventional sequences for visualizing hemorrhage and vascular structure. SWI can provide useful additional information in the evaluation of various pediatric neurologic conditions.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[MRI diagnosis of hypothalamic hamartomas in children]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.008</link>
<description><![CDATA[Objective: To sum up the typical or atypical MR imaging features of hypothalamic hamartoma and improve the diagnostic level of this disease. Materials and Methods: Eighteen cases of hypothalamic hamartomas were conformed by pathology, 12 males and 6 females, aged 1-15 years, mean 5.6 ± 3.8 years. The clinical and MR imaging ﬁndings were retrospective analyzed. The clinic symptoms included precocious puberty (n=14) and gelastic epilepsy (n=7). All patients were examined with sagittal T1 and T2 weighted imaging, coronal T1 weighted imaging, sagittal and coronal T1 weighted imaging enhancement. Results: Typical performance of 8 cases were round or oval mass located or between pituitary stalk and the mammillary body, 8 cases showed iso-intensity on T1 weighted imaging, similar with grey matter and slight hyper-intensity on T2 weighted imaging, On contrast MR scan, there was no enhancement in all cases. In 10 atypical cases, 3 cases were with atypical location but typical signal (1 case was behind the saddle department, 1 case grew across the optic chiasm, 1 case was above the mammillary body); 7 cases were with typical location but atypical signal, they showed hypo-intensity or mixed intensity on T1 weighted imaging and hyper-intensity or mixed intensity on T2 weighted imaging. Conclusion  It is not difﬁcult to diagnose the hypothalamic hamartoma with typical location and MRI signal characteristics, when MRI signal or the location of lesions is not typical, combined with its clinical features that precocious puberty or gelastic epilepsy, a correct diagnosis may be achieved.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[MRI diagnosis of fetal corpus callosum agenesis]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.009</link>
<description><![CDATA[Objective: To explore the diagnostic value of MRI on fetal agenesis of corpus callosum (ACC). Materials and Methods: Thirty-nine pregnant women, aged from 19 to 35 years (average 29 years) and with gestation from 22-39 weeks (average 29 weeks) were studied with a 1.5 T superconductive MR unit within 24 to 48 hours after ultrasound examination. The imaging protocol included fast-imaging employing steady-state acquisition (FIESTA), single-shot fast spin echo (SSFSE), T1-weighted fast inversion recovery motion insensitive (FIRM) and diffusion-weighted imaging (DWI) sequences in the axial, frontal, and sagittal planes relative to the fetal brain, thorax, abdomen, especially brain. Prenatal US and MR imaging ﬁndings were compared with postnatal brain MRI diagnosis (20 fetuses) or postmortem examination (19 fetuses). Results: In 39 cases of ACC, 32 cases were complete agenesis and 7 were partial agenesis; 31 cases were simple ACC, 8 cases were with other malformations. Follow-up results were consistent with prenatal MRI diagnosis, prenatal US missed or misdiagnosed 19 cases of ACC or combined deformity. Conclusion  Fetal MRI is currently the best means of diagnosing ACC. It can directly show the existence of the corpus callosum, and better show the combined brain malformation of ACC.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Three-dimensional MR reconstruction of anterior cruciate ligament]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.010</link>
<description><![CDATA[Objective: To investigate the value of three dimensional reconstruction technique of 1.5 T MR in evaluation of anterior cruciate ligament (ACL). Materials and Methods: Thirty normal volunteers and 11 patients who had ACL injury, underwent MR of knee joint including sagittal scanning of T1WI, fat suppressed-fast spin echo-T2 weight (FS-FSE-T2W), coronal fat suppressed PDWI and M3D/cube T2WI. All images were reconstructed using ADW 4.4 workstation. The routine MR image and M3D/cube T2W images were compared. Results: Routine MRI: Sixteen cases were showed completely in one image, 14 cases were showed completely in two continues images; All the 30 cases were showed completely in M3D/cube T2WI in normal group. Two cases showed no injury, 3 cases showed ACL partial tears, 6 showed completely collapse in 11 ACL injuries in routine MRI; 5 cases showed ACL partial tears, 6 cases showed completely collapse in M3D/cube T2WI. Conclusion: M3D/cube T2WI could improve the diagnosis rate of ACL, it will be one of the best imaging technique to show ACL.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Differential diagnosis between pancreatic cancer and chronic pancreatitis by enhanced scanning of both CT and MRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.011</link>
<description><![CDATA[Objective: To evaluate the value of combined application of enhanced scanning of both MSCT and MRI in differential diagnosis between pancreatic cancer and chronic pancreatitis. Materials and Methods: Enhanced scanning images of both MSCT and MRI of pancreatic cancer in 31 cases and chronic pancreatitis in 25 cases were analyzed retrospectively. The image features  of both pancreatic cancer and chronic pancreatitis were sumerized, and the differences of image features  between pancreatic cancer and chronic pancreatitis were stated. The differences in differential diagnosis between Pancreatic Cancer and Chronic Pancreatitis by MSCT, MRI respectively, or both MSCT and MRI were also stated. Results: Volume of tumor, infiltration into blood vessel or tissue nearby, intumescent lymph node, scarcely-enhanced mode of tumor and irregular distention of chol-pancreatic duct were relative to pancreatic cancer. Cyst in tumor or nearby, calcification in tumor and smooth distention of chol-pancreatic duct were relative to chronic pancreatitis. There were signiﬁcant differences in the signals above between pancreatic cancer and chronic pancreatitis (P<0.05). The accuracy in distinguishing pancreatic cancer from chronic pancreatitis by both MSCT and MRI was higher than that by MSCT or MRI respectively (P<0.05). There were not differnces in diagnosing pancreatic cancer from chronic pancreatitis either by MSCT or by MRI (P>0.05). Conclusion: It was useful to distinguish pancreatic cancer from chronic pancreatitis by combined application of enhanced scanning of both MSCT and MRI.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Correlation of microarchitecture and apparent diffusion coefficient value in astrocytoma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.012</link>
<description><![CDATA[Objective: To analyze the difference of ADC in astrocytomas with different grade and the relationship between microarchitecture and ADC value using DWI at 3T. Materials and Methods: Seventeen patients with astrocytoma (including 5 I/II grade astrocytomas, 5 III grade astrocytomas and 8 IV grade astrocytomas) were examined. ADC of each case was obtained. Statistical analysis were performed using SPSS 11.0 package. One-Way ANOVA was used to analyze the difference of ADCs in different grade astrocytomas. Pearson correlations were calculated between ADC value and microarchitecture. Results: ADC tended to reduce from low- to high- grade astrocytomas and the differences between I/II grade and III or IV grade astrocytoma were significant. Significant correlations were revealed between ADC and MVD (r=-0.516, P=0.013) and ADC and cell density (r=-0.618, P=0.025). Conclusion: ADCs are different between low- and high- grade astrocytoma and can represent the microarchitecture in astrocytoma. DWI is helpful in preoperative grading of astrocytomas.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Elevated Lip signals on 1H-MR spectroscopy in differential diagnosis of intracranial lesions]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.013</link>
<description><![CDATA[Objective: To investigate the clinical value of elevated Lip signals on proton MR spectroscopy (1H-MRS) in the differential diagnosis of intracranial lesions. Materials and Methods: 125 patients with intracranial lesions were examined by conventional MR imaging and multivoxel 2D 1H-MRS before treatments or operations, including meningiomas (n=20), low-grade gliomas (n=19), high-grade gliomas (n=15), metastases (n=21), lymphomas (n=4), germinomas (n=3), teratomas (n=2), intraaxial tuberculomas (n=26), and brain abscesses (n=15). 1H-MRS was performed using PRESS sequence (TR 1000 ms, TE 144 ms). Concentrations of choline (Cho), creatine (Cr), and N-acetylaspartate (NAA) in the lesions were expressed as metabolite ratios. The ratios of Cho/Cr, Cho/NAA and positive ratio of Lip from the solid part of the lesions were calculated and analyzed. Results: There was significant difference on the positive ratios of lipid among the lesions (P<0.01). The positive ratios of lipid in lymphomas, germinomas, and teratomas were the highest and those of the low-grade gliomas and meningiomas were the lowest. Signiﬁcant difference was also found on the ratios of Cho/Cr and Cho/NAA among the benign lesions, low-grade malignancy and high-grade malignancy (Cho/Cr were 1.92±0.75, 2.30±0.86, and 3.88±2.08 respectively, P<0.01; Cho/NAA were 1.80±0.92, 2.21±0.14, and 3.75±2.02 respectively, P<0.05). The ratios of Cho/Cr and Cho/NAA of high-grade malignancy were the highest and those of benign lesions were the lowest. There was no significant difference on the ratios of Cho/Cr and Cho/NAA between the benign lesions and low-grade malignancy. Conclusion: Elevated Lip signals reveal different pathological characteristics. Lip combined with Cho/Cr, Cho/NAA and conventional MR imaging plays an important role in the differential diagnosis of intracranial lesions.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Dynamic susceptibility contrast perfusion weighted MR imaging in grading of meningioma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.014</link>
<description><![CDATA[Objective: To investigate the feature and clinic value of dynamic susceptibility contrast perfusion weighted MR imaging (DSC-PWI) in different grades of meningioma. Materials and Methods: Total of 92 patients with meningiomas confirmed by operation and pathology underwent conventional MRI and DSC-PWI before resection using a 3.0 T MR unit. The perfusion color images and time-signal intensity curves (TIC) were analyzed. Maximal relative cerebral blood volume (rCBV) of the same ROI within both tumor parenchyma and peritumoral edema were calculated and the data were analyzed with unpaired Student’s t-test analysis. Grading and classifying of meningiomas were according to 2007 WHO classification and grading of tumors. Results: Seventy-eight patients suffered from benign meningiomas and 14 patients with malignat meningiomas. On the rCBV images, the perfusion in parenchyma of benign and malignant meningiomas increased, the perfusion of the peritumoral edema decreased in benign meningioma, and increased in malignant meningioma. The mean maximal rCBV values within the tumor parenchyma of the benign and malignant meningioma were 9.880±3.682 and 11.651±1.597 respectively (t=1.764, P=0.081). The mean maximal rCBV values within the peritumoral edema were 1.003±0.506 and 2.848±1.182 respectively (t=9.803, P=0.000). When the TIC were compared after the first pass, the decrease extent of signal intensity within the tumor parenchyma of all meningiomas were larger than the contralateral white mater, the decrease extent of signal intensity within the peritumoral region of benign meningiomas were less than or equal to the contralateral white mater, but in malignant meningiomas show that it is larger than the contralateral white mater. Conclusion: DSC-PWI can provide useful information in grading and subtyping of meningiomas.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Magnetic resonance imaging of congenital heart disease in children]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.015</link>
<description><![CDATA[Congenital heart disease (CHD) is a relatively common problem with an incidence of approximately seven per 1,000 live births. Children with CHD usually undergo an echocardiogram (ECHO), and, if diagnostic, the appropriate management pathway would be followed. However, if ECHO cannot resolve the diagnostic problem, patients will now be referred for cardiovascular magnetic resonance (MR) or multislice CT. The major limitation of CT is the use of ionizing radiation and MR may well become a one-stop shop for morphological or functional evaluation of congenital heart disease in the preoperative and postoperative period. The purpose of this paper was to evaluate the scanning technique and the clinical application of magnetic resonance examination in children with CHD. T1-weighted spin-echo sequence, gradient-echo cine sequence and contrast enhancement magnetic resonance angiography (CE-MRA) should be performed in every case. CHD can be diagnosed by magnetic resonance imaging safely and reliably. CE-MRA is the most reliable noninvasive imaging diagnostic modality for congenital obstructive aortic arch anomalies and congenital obstructive total anomalous pulmonary venous return.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[syngo NATIVE: non-contrast-enhanced MR angiography]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.016</link>
<description><![CDATA[Gadolinium-based contrast agents have been administrated widely for MR angiography. However, the realization that they may be a factor in the development of nephrogenic systemic fibrosis (NSF) in patients with impaired renal function has created a great interest in the non-contrast-enhanced MR angiography techniques. Siemens syngo NATIVE provides two different non-contrast MR angiography techniques: syngo NATIVE TrueFISP and syngo NATIVE SPACE. The former is optimized for abdomen region, especially the renal arteries and the latter is optimized for peripheral arteries. The purpose of this paper is to introduce the technical background and their current clinical applications.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Status of MR imaging for cerebral neoplasms]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.01.018</link>
<description><![CDATA[Combined usage of various MRI scanning modalities can evaluate the morphological, functional, hemodynamic status and molecular changes of cerebral neoplasms. Clinically, it is helpful for the pathological grading, operation plan, observation of therapeutic results, and judgment of prognosis and recurrence of the tumors. The research and current status of clinical application of MRI were reviewed in this article.]]></description>
<pubDate>Thu,20 Jan 2011 00:00:00  GMT</pubDate>
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